I installed & setup my shifter onto my Eagle xx1 derailleur without any dramas. Used the app to change to 12 speed (it it seemed to be set to 11 from the factory), and did some tuning. Everything was great. I did a short test ride without issue. I decided to charge the unit overnight & the next morning the app had deleted both the shifters I have. Not sure how or why, but I was surprised that it couldn’t find either device. The pods for both units also managed to become unpaired. I needed to do a full reset on the shifter to get the app to see it, then go through the manual setup again. Works now, but a bit of a mystery as to what happened. I still need to add the 2nd shifter to the app again.